Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 17: Structure and Dynamics of Nuclei III

HK 17.6: Vortrag

Montag, 28. März 2022, 17:30–17:45, HK-H6

Transition strengths of the intruder band of ⁹⁶Zr — •T. Stetz¹, T. Beck¹, N. Pietralla¹, V. Werner¹, M. Boromiza², I. Gheorge², A. Ionescu², R. Kern¹, R. Lica², N. Mărginean², R. Mărginean², C. Mihai², R.-E. Mihai², C.R. Nita², O. Pabst¹, S. Pascu², C. Sotty², L. Stan², A. Turturica², J. Wiederhold¹, and W. Witt¹ — ¹TU Darmstadt, Germany — ²IFIN-HH, Romania

The zirconium (Zr) isotopes have recently been discussed in terms of type-II shell evolution [1,2], with ⁹⁸Zr closest to the critical point of a quantum phase transition from spherical to deformed ground-state shapes [3,4]. Spherical and deformed structures were found to coexist, weakly mixing, already in ⁹⁶Zr [2], but key data to classify the observed structures is missing [4]. Therefore, ⁹⁶Zr has been studied in an experiment, populating excited states of the intruder band in the 2n transfer reaction ⁹⁴Zr(¹⁸O,¹⁶O)⁹⁶Zr at 49 MeV at the 9 MV tandem accelerator in IFIN-HH. The HPGe ROSPHERE array in a combination with the SORCERER particle detector was used to obtain the data. With the Doppler shift attenuation method, the lifetime of the first excited 4⁺ state was determined. From this, transition strengths to lower lying states have been obtained and compared with theoretical approaches in order to study the shape of the intruder band.

[1] T. Togashi et al., Phys. Rev. Lett. 117 172502 (2016)

[2] C. Kremer et al., Phys. Rev. Lett. 117 172503 (2016)

[3] W. Witt et al., Phys. Rev. C 98 041302 (2018)

[4] W. Witt et al., Eur. Phys. J. A 55 79 (2019)

*Supported by BMBF 05P18RDCIA-TP1 and 05P21RDCI2-TP1.